To add to that notion:
Filters degrade and break down over time, that means that old asbestos-filters will become insanely hazardous, once the fibres become loose and the membrane that keeps them inside becomes broken. In WW1, filters used 80% asbestos and a lot of people, that used them during the war, would die in the 20s. Even Soviet made filters with a lot less asbestos are an issue, since production quality of them is sketchy at best, so they might have less asbestos, but you can't trust that it would stay where it should, even when they were new. 30+ years later, and these fibres are going to be a huge problem.
And just to add some more fun to all this: Old Soviet-era filters are often painted with lead paint. It's not safe to handle them, it is outright moronic to use them.
Assuming you are a healthy guy between 20 and 55, any issue you can get from catching the WuFlu is far less severe, than what you will get when you use such an old filter with asbestos fibres being directly injected into your lungs with every breath. It will not take 50 years and it is not worth the risk.
Corona is not "just the flu bro", sure. But unless you are 70+ years old or have a severe sickness that makes you more vulnerable to Corona, using such a filter is -without the least bit of exaggeration- a level or retardation, that makes Chris look like Einstein.
No. No they are not and you are a complete moron for saying this.
If your choice in the current situation is between nothing and an asbestos filter, your best choice is to pick nothing. Hell, if your choice is between asbestos filters and drinking from a cup used by a known COVID-patient, you'd be better off picking the cup.
Corona is not Super-Ebola-Aids. It is nasty and it has killed (and will continue to kill) many people. However, assuming you are a healthy person, your chance of Corona going bad are about 20%, your chance of getting severely sick are like 5% and your chance of death is lower still. Your chance of fucking up your lungs are precisely 100% when you use an old asbestos filter. Full stop.